* {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

#video_player {
    width: 640px;
    height: 610px;
    background: #535353;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 15px;
    position: relative;
}

#play_list {
    position: absolute;
    bottom: 0;
}

.video_content,
li.selected .video_content {
    visibility: visible;
}

.video_content {
    position: absolute;
    top: -30px;
    width: 640px;
    height: 450px;
    overflow: hidden;
    margin: -420px 0 0 -340px;
    visibility: hidden;
    color: #cccccc;
    left: 50%;
    padding: 10px 20px;
    box-sizing: border-box;
    font-family: "Microsoft JhengHei", "Heiti TC", "WenQuanYi Zen Hei", sans-serif;
}

.video_content>video {
    position: absolute;
    bottom: 0;
    left: 50%;
    margin: 0 0 0 -320px;
}

.video_title {
    font-family: "Microsoft JhengHei", "Heiti TC", "WenQuanYi Zen Hei", sans-serif;
    font-size: 1.3em;
    font-weight: bold;
    color: #fff;
}

.list_name {
    font-size: 1.2em;
    margin: -10px 0 0 20px;
    cursor: pointer;
    display: inline-block;
    width: 640px;
}

li {
    float: left;
    width: 640px;
    height: 40px;
    padding: 20px;
    transition: .25s linear;
    color: #ccc;
    font-family: "Microsoft JhengHei", "Heiti TC", "WenQuanYi Zen Hei", sans-serif;
    vertical-align: middle;
}

li:hover {
    background: #283583;
    color: #fff;
}

li.selected {
    background: #283583;
    color: #fff;
}

.list_name>img {
    border: 1px solid #ccc;
}